Drea de Matteo and Shooter Jennings welcomed their second child today -- a baby boy. These two are pros at super-creative names -- their 3-year-old daughter's name is Alabama Gypsyrose. And they didn't disappoint this time!

"Waylon Albert 'Blackjack' Jennings has arrived," Shooter tweeted Thursday. "Thanks to all the kind words folks! We're super lucky to have so many kind friends."

The name is a nod to Shooter's dad Waylon Jennings -- the singer/musician best known for his duet with Willie Nelson -- Mammas Don't Let Your Babies Grow Up To Be Cowboys -- and for recording the theme song for The Dukes of Hazzard TV show. So no doubt, little Waylon's got country in his blood!

Drea, 39, and Shooter, 31, have been together for nine years and got engaged in June 2009.